Patent GB-767958-A (GB)
Title: A process for improving the surface properties of powders
IPC: C09C3/00
Filed: 1953-11-20
Abstract: The surface properties of powders are improved by impregnating them with a mixture of a metal salt of a sulphonic acid or of an acid sulphuric acid ester, and a salt of a sulphonic acid or of an acid sulphuric acid ester with ammonia or an organic base.  The powders, which may be pigments for lacquers, oil colours, or synthetic resins, or fillers for natural or synthetic rubber or rubber substitutes, include inorganic oxides, hydroxides and salts, e.g. ochre, red iron oxide, red lead, titanium dioxide, zinc sulphide, barium sulphate, carbon, black, zinc oxide, finely dispersed dehydrated silicic acid, silica gel, calcium silicate or aluminium silicate; powder bases such as talcum, rice flour and starch, fuller's earth, kaolin, pumice stone powder and alumina; and active carbon, cork meal and wood meal. Impregnation may be effected by stirring the powders into solutions of the salt mixtures, filtering off the powders and drying them, or by sprinkling the solutions on to the dry powders, or by applying the salt mixtures to the powders by grinding or crushing in an edge mill, the components being either dry or moistened.  The acid components of the salts include acid sulphuric acid esters of aliphatic, cycloaliphatic and araliphatic alcohols, and sulphonic acids with an aliphatically or aromatically bound sulphonic acid group; the alkyl residues may contain heteroatoms and substituents.  The inorganic salts may be e.g. those of sodium, potassium, calcium, magnesium and aluminium, and primary, secondary or tertiary bases such as octylamine, dioctylamine, cyclohexylamine, diethylcyclohexylamine, monomethylaniline, diethylaniline, diethylaniline, monoethanolamine, tiethanolamine, morpholine, piperidine, pyridine and quinoline can be used as organic bases.ALSO:The surface properties of powders are improved by impregnating them with a mixture of a metal salt of a sulphonic acid or of an acid sulphuric acid ester, and a salt of a sulphonic acid or of an acid sulphuric acid ester with ammonia or an organic base.  The powders, which may be pigments for lacquers, oil colours, or synthetic resins, or fillers for natural or synthetic rubber or rubber substitutes, include inorganic oxides, hydroxides and salts, e.g. ochre, red iron oxide, red lead, titanium dioxide, zinc sulphide, barium sulphate, carbon black, zinc oxide, finely dispersed dehydrated silicic acid, silica gel, calcium silicate or aluminium silicate; powder bases such as talcum, rice flour and starch, Fuller's earth, kaolin, pumice stone powder and alumina; and active carbon, cork meal and wood meal.  Impregnation may be effected by stirring the powders into solutions of the salt mixtures, filtering off the powders and drying them, or by sprinkling the solutions on to the dry powders, or by applying the salt mixtures to the powders by grinding or crushing in an edge mill, the components being either dry or moistened.  The acid components of the salts include acid sulphuric acid esters of aliphatic, cycloaliphatic and araliphatic alcohols, and sulphonic acids with an aliphatically or aromatically bound sulphonic acid group; the alkyl residues may contain heteroatoms and substituents.  The inorganic salts may be e.g. those of sodium, potassium, calcium, magnesium and aluminium, and primary, secondary or tertiary bases such as octylamine, dioctylamine, cyclohexylamine diethylcyclohexylamine, monoethylaniline, diethylaniline, diethylaniline, monoethanolamine, triethanolamine, morpholine, piperidine, pyridine and quinoline can be used as organic bases.